Mfp
平均自由路程
??? 情景例句
I'm calling to ask you some questions about Susan.
我打電話是想問一些關于蘇珊的事。
The best is oftentimes the enemy of the good.
要求過高反難成功。
In it there was a boatman fast asleep.
船上有一船夫在呼呼大睡。